Hot-air-furnace regulator



July 27 1926a 1,593,581

J. M. LARSON HOT AIR FURNACE REGULATOR Filed June 17, 1925 Patented July 27, 1926.

UNITED STATES 1,593,581 PATE NT OFFICE.

JOHN M. LARSON, OF CHICAGO, ILLINOIS, ASSIGNOR TO NATIONAL REGULATOR COM- PANY, OF CHICAGO, ILLINOIS, A CORPORATION OF HOT-AIR-FURNACE REGULATOR.

ILLINOIS.

Application filed June 17, 1925. Serial No. 37,642.

My invention devices. I

One of the objects of my invention is to provide a heat-controlling device which can be readily applied to hot air furnaces.

Further objects will appear from the description and claims.

In the drawings, in which my invention is illustrated,

Figure 1 is a perspective view showing a hot-air furnace equipped with my approved regulating device;

Fig. 2 is a side elevation of the regulating device; Fig. 3 is a section substantially on the line 33 of Fig. 2; and

Fig. 4 is a section substantially on the line 4-4 of Fig. 3.

Referring to the drawings in detail, the construction shown comprises a hot-air furnace which may be of any usual or suitable relates to heat-controlling construction having a hot-air chamber 1 from the upper end of which the pipe connections 2 lead, and having suitable draft regulating devices 3 and 4, a heat regulating device 5 secured to the side of the hot-air chamber and suitable transmission from the heat-regulating device to the draft regulator devices. 1

An opening is provided in the side of the heatingchamber, which is closed by a readily detachable closure member 6. On this closure member 6 the heat-regulating device 5 is mounted. This heat-regulating device comprises a plurality of separate individual gas-containing heat-expansible cells 7, an open cage 8 mounted on the closure member 6 and in which these cells are stacked and held, a rock shaft 9 extending through and mounted on the closure member, a rock arm 10 mounted on the inner end of this shaft 9 and actuated by the stack of expansible cells, and a rock arm 11 on the outer end of the rock shaft and connected with the transmission to the draft-regulating device.

This transmission from the regulating de vice to the draft-controlling devices comprises a link 12 pivotally connected at one end with the rock arm 11, a two-armed lever 13 pivotally mounted on the closure at 14 and pivotally connected at 15 with the link 12, a flexible pull member 16 extending from one end of the two-armed lever 13 to the damper 3 which controls the admission of a1r means of a sleeve 2 to the combustion chamber and a flexible pull member 17 extending from the other end of the two-armed lever to the damper :11 which controls the admission of air to the The closure member is secured to the side of the combustion chamber by means of a pair of channel clamping bars 18 inside the heating chamber and screws 19 extending through these clamping bars and through the uxtaposed overlapping portions of the wall of the heating chamber and the closure member and provided with nuts 20. This construction enables the closure member to be secured to almost any style of hot-air furnace regardless of whether the walls are flat or curved as the clamping bars can be drawn up so as to flatten out the slightly curved walls of the heating chamber adjacent the closure member.

The rock shaft 9 is mounted in a long bearing 21 forming part of a bearing bracket 22 secured on the outer end of the closure member by means of screws 23. This bracket 22.also has an L-shaped extension 24 on the upper end of which the two-armed lever is pivotally mounted atll. This two-armed lever is made in readily detachable sections to facilitate shipping. The sections are provided with interengaging dovetail portions 25 which are held in connected position by slipped over the dove tail joint.

The upwardly extending pull members 16 and 17 are provided with suitable counter weights 27 to counterbalance the weight of the dampers. The arrangement of the flexible pull members facilitates extending the transmission from the two-armed lever to the dampers, as the vertical portions of the pull members may extend between the pipes leading from the pipe connections 2, and the horizontally extending portions of the flexible connections enables the actuating device to be mounted at any desired place on the side of the hot-air chamber. Suitable puileys 28 are provided for the flexible pull members.

A suitable adjustable weight 29' is pro vided on the two-armed lever 13 which enables any desired temperature regulation to be obtained. regulated temperature, the counterweight is shifted further from the fulcrum 14 of the If it is desired to increase the in a graduated manner and held in metrically extending 5 rivet 33, the head two-armed lever which tends to open the damper 3 controlling the admission of air to "the combustion chamber and tends to close the flue damper 4.

7 The stack of diaphragm cells acts on the "rock arm 10 through a bearing plate 30, which rests on the top cell and is pivotally secured to the rock arm 10 at 31. The rock arm 31 :with the bearing plate 30 can be swung up out of the way of the stack of cells to permit the removal of these cells for inspection and repair, when desired.

In operation, if the furnace is operating in such a way as to give a temperature higher than that desired, and for which the regulator is set, the stack of expansible cells expands and through the transmission described operates to allow the damper controlling the admission of air to close slightly and cause the check damper to open slightly, thus checking the heat. It the temperature drops the reverse operation takes place; i

It will be noted that theaction is a graduated action, that is to say, the dampers are not moved to completely open or close as in other forms of control but they are operated just the right position to give the desired tempera ture. 7

The bottom'of the cage may comprise diaoverlapping metal together by means of of which engages a corresponding depression 34 in the lower wall of the adjacent expansible cell 7 to center straps 32 secured *the stack of cells with respect to the cage.

I claim:

1. The combination with a hot air heating apparatus comprising a hot air chamber, heating means gtor heating the air in said chamber, and adjustable means for control ling said heating means, the wall of said chamber having an opening therein, of an outwardly dished closure member for closing said opening, and means for'gradually adjusting said adjustable means, comprising a heat-responsive device located partly in said chamber and partly in said dished closure member and mounted on said closure member.

2. The combination with a hot air heating apparatus comprising a hot air chamber, heating means for heating the air in said chamber. and adjustable means for controlling said heating means, the wall of said chamber having an opening therein, of a closure member for closing said opening, and means for gradually adjusting said adjustable means, comprising a heat-responsive device in said chamber and mounted on said closure member, said closure having portions overlapping the edges of said opening, and means for securing said closure in place, comprising clamping bars extending along the edges of said opening, and securing means extending through said overlapping portions and clamping bars.

3. The combination with a hot air heating apparatus comprising a hot air chamber, heating means for heating the air in said chamber, and adjustable means for controlling said heating means, the'wall of said chamber having an opening therein, of a closure member for closing said opening, and means for gradually adjusting said adjustable means, comprising a heat-responsive device in said chamber and mounted on said closure member, device comprising a heat-expansible fluid chamber, and a cage open to permit the passage of the hot air in'the chamber to the inside of the cage mounted on the inside of said closure in which cage said expansible fluid is held.

4:. The combination with a hot air heating apparatus comprising a hot air chamber and having a substantially vertical wall, heating means for heating the air in said chamber, and adjustable means" for controlling said heatingemeans, the vertical wall of said chamber having an opening therein, ofl'a closure member for closing said opening, and means for gradually adjusting said adjustable means, comprising a heat-responsive device in said chamber and mounted on said closure member, and transmission from said adjusting means to said adjustable means comprising a rock shaft extending substantially perpendicularly to the vertical'wall of the chamber and mounted on and extending through said closure member.

transmission from said adjusting means to said adjustable means comprising a rock shaft extending substantially perpendicular- 1y to the vertical wall of the chamber and mounted on and extending through said closure member, and a rock arm on said shaft inside said chamber.

6. The combination with a hot air heating apparatus comprising a hot air chamber and having a substantially vertical wall, heating means for heating the air in said chamber, and adjustable means for controlling said heating means, the vertical wall of said chamber having an opening therein, of a closure member for closing and mounted wall said opening, and means for gradually adjusting said adjustable means, comprising a heat-responsive device in said chamber and mounted on said closure member, and transmission from said adjusting means to said adjustable means comprising a rock shaft extending substantially perpendicularly to the vertical wall of the chamber on and extending through said closure member, and a rock arm on said shaft outside said chamber.

7 The combination with a hot'air heating apparatus comprising a hot air chamber and having a substantially vertical wall, heating means for heating the .air in said chamber, and adjustable means for controlling said heating means, the vertical of said chamber having an opening therein, of a closure member for closing said opening, and means for gradually adjusting said adjustable means, com rising a heat-responsive device in said 0 amber and mounted on said closure member, and transmission from said adjusting means to said adjustable means com rising a rock shaft extending substantial y perpendicularly to the vertical wall of the chamber and mounted on and extending through said closure member, and a rock arm on said shaft outside said chamber, said rock arm having a readily detachable extension.

8. The combination ing apparatus comprising a hot air chamer having a vertical wall, heating means for heating the air in said chamber and adjustable means for controlling said heating means, of means for gradually adjusting said heat adjustable means, comprising a heat responsive device in said chamber, a rock shaft extending through the vertical wall of said chamber substantially perpendicularly to said vertical wall, and a rock arm on said shaft outside said chamber, said rock arm having a readily detachable extension. I

In witness whereof, I have hereunto subscribed my name.

JOHN M. LARSON.

with a hot air heata 

